Answer:
C. Streams.
Streams are able to sort sediment and particles by size and weight through the process of hydraulic sorting. As water flows in a stream, it exerts different amounts of force on particles depending on their size and weight. Heavier and larger particles settle out first, while lighter and smaller particles remain suspended in the water for longer distances. Over time, this sorting process results in distinct layers or beds of sediment, with the largest and heaviest particles found in the bottom layer, and the smallest and lightest particles found in the top layer.
While wind, glaciers, and waves on a beach can also sort sediment, they are generally not as effective as streams. Wind can sort particles by size to some degree, but it is not as effective as streams because it cannot exert the same amount of force on particles as water. Glaciers can sort particles by size and weight, but the process is slow and generally not as well-defined as in streams. Waves on a beach can sort particles by size, but their sorting ability is limited by the constant mixing and movement of sediment caused by the waves.